Surround in Apple Music (not Atmos) - how to find it?

[MartinGr]

I didn't even know it exists - but when I looked after Return to Forever's last album , my iPhone showed me "Dolby Audio" as the format, not Atmos. And my Apple TV streamed the Quad mix, as released by Dutton Vocalion. It even says "lossless".
Are there more titles like this? And how to find them?
Thanks
Martin

 

[sjcorne]

Music streaming on Apple Music in 5.1 (Dolby Audio)

So I know that Dolby Audio has started cropping up in places on Apple Music. Seems to be 5.1 mixes that they're making available. I confirmed 5.1 from my AppleTV from an album mentioned in another thread here. But there have also been some mishaps with stuff showing as Dolby Audio in places but...

www.quadraphonicquad.com